JPS601023A - Cooler for vehicle - Google Patents

Abstract

PURPOSE:To prevent a blower fan from sucking condensed water for improving durability by inclining the bottom surface of a cooling unit such that the upstream side of a built-in evaporator is lower than the downstream side, and providing a condensed water pool on the bottom surface of the upstream side. CONSTITUTION:Condensed water flowing down mainly from the downstream side of a evaporator 2 in cooling flows to the upstream side of the evaporator 2 along the inclined surface 1' of a case 1, flows into a water pool 4 provided on the bottom surface of the upstream side and flows out to the outside from a drain hole 5 when it reaches a predetermined level. Here, intake negative pressure produced by the rotation of a blower fan 3 at the upstream side of the evaporator 2 is about 1/8-1/10 of that at the downstream side. Since the water pool 4 is spaced from the blower fan 3, possibilities are not there that the condensed water is sucked into the blower fan 3 to wet the fan 3, the downstream side parts, etc. Thus, the durability of parts can be improved while the condensed water can be easily drained from the drain hole 5 to maintain the level in the water pool 4 as it is set.

Description

[Detailed description of the invention] The present invention relates to a cooling device 1 for a vehicle.

In a cooling device, indoor air is cooled by a blower fan while passing through an evaporator, and as a result of the cooling, moisture in the air is condensed and separated and adheres to the evaporator. The evaporator is installed at an angle inside the evaporator case, which also serves as a duct, so that the water droplets of condensed water that have accumulated in the evaporator do not get on the circulating air flow and blow out indoors mixed with the cold air. In addition to making it easier for water droplets that have adhered to the evaporator to flow downstream in the air flow direction, a water reservoir is formed in the bottom of the case on the downstream side of the evaporator to collect the water droplets. Usually, the condensed water accumulated in the water reservoir is discharged to the outside through a drain hole provided in the water reservoir (see, for example, Meiko No. 51-543<50).

As shown in Figure 1, as a cooling system for a bus, a cooling unit A is installed on the vehicle body, in which an evaporator 2 is installed inside a case 1, and a blower fan 3 is installed outside the air outlet 1h of the case 1. The interior air is sucked in from the suction port 1α by the rotation of the blower fan 3, and while the air passes through the evaporator 2, it is cooled and becomes cold air. A so-called under-floor air conditioner that blows air out is generally used, but even in such an under-floor air conditioner, conventionally the evaporator 2 is installed in the case 1 with the evaporator 2 tilted toward the downstream side as described above. In addition, a water reservoir 4 for collecting condensed water and a drain hole 5 are usually provided at the bottom of the case 1 on the downstream side of the evaporator 2.

Furthermore, in the conventional device, an outside air inlet 6 communicating with outside air is provided on the side of the case 1 upstream of the evaporator 2, that is, as shown in FIG. 1, on the upstream side of the evaporator 2. By rotating the fan T, outside air is introduced into the case 1 through the outside air inlet 6 from the roots (9) provided on the outer panel 8 of the vehicle body, and is mixed with the interior air taken in from the suction port 1α to generate the evaporator 2. It passes through and blows out into the passenger compartment.

In the conventional device as described above, since the water pool 4 is provided downstream of the evaporator 2, a large negative pressure from the ventilation fan 30 acts on the water pool 4, and the water accumulated in the water pool 4 is The condensed water reaches a certain level and the water pressure increases to fan 3.
The condensed water is discharged from the drain hole 5 only after it overcomes the negative pressure of There is a problem in that the fan and the parts on the downstream side become wet and rust is likely to occur.

Furthermore, when there is little or no condensed water in the water reservoir, high-temperature outside air is sucked into the downstream side of the evaporator 2 through the drain hole 5, which causes the problem that the temperature of the blown cold air increases, leading to a decrease in the cooling effect. .

Furthermore, during ventilation, high-temperature outside air is introduced into the case 1 through the outside air inlet 6, which increases the heat load and raises the temperature inside the vehicle.

The present invention solves all the above-mentioned conventional problems by 1'l'(
The present invention will be explained below with reference to the actual sister examples shown in FIGS. 2 to 7.

2 and 3 show a first embodiment of the present invention, in which the bottom surface of the case of the cooling unit A is inclined so that the upstream side of the evaporator 2 is lower than the downstream side, and the evaporator 2 of the case 1 is A water puddle 4 in which condensed water collects is placed on the bottom part on the downstream side.

A drain hole 5 is provided in the side wall of the water reservoir 4 so that the condensed water is always maintained at a predetermined water level as shown in the figure, and one end 10α is connected to the outside air. An outside air introduction pipe 1 whose end portion 10h projects a predetermined height above the water surface of the condensed water in the water reservoir 4 and opens at the upstream front surface of the evaporator 2, and is located in the condensed water accumulated in the water reservoir 4 during that time.
0 are arranged in parallel as shown in FIG. It is designed to be introduced in

Reference numeral 11 denotes an inspection opening/closing lid provided on the outer surface of the case 1.

- In the above configuration, during cooling, the condensed water flowing down mainly from the downstream side of the evaporator 2 is moved upstream from the evaporator 2 by the slope 1' of the bottom surface of the case 1! The water flows into the water reservoir 4 provided at the bottom of the upstream side, and when it reaches a predetermined water level, it flows out through the drain hole 5.

In this case, the suction negative pressure on the upstream side of the evaporator 2 due to the 30 rotations of the ventilation fan is approximately 1/8 to 1/'l of the downstream side.

This, together with the fact that the water pool 4 is far away from the blower fan 3, prevents problems such as condensed water being sucked into the blower fan 3 and wetting the fan 3 and parts downstream thereof. The durability of these parts can be significantly improved, and the condensed water can be easily discharged from the drain hole 5, and the level of the condensed water in the water reservoir 4 can be maintained at approximately the preset level.

In addition, outside air is drawn into the case 1 through the outside air introduction pipe 10, and the high temperature outside air is cooled with cold condensed water while passing through the outside air introduction pipe 10, and then cooled together with the intake indoor air in the evaporator 2. Since the air is blown into the room, there is almost no increase in heat load, and a sufficient cooling effect can be obtained even if ventilation is always performed during cooling as shown in the second figure.

The condensed water in the water reservoir 4 absorbs heat from the high-temperature outside air in the outside air introduction pipe 1o, and when the temperature rises, it rises above the water surface and rises to the drain hole 5.
As the cold condensed water flowing down from the evaporator 2 gradually flows into the water reservoir 4, the outside air introduction pipe 1
The cooling of the outside air taken in from 0 is performed extremely accurately and effectively.

As shown in FIG. 4, a control valve 12 is provided to control the opening/closing and flow rate of the outside air introduction pipe 10, and the control valve 12 is provided from the driver's seat.
2 may be operated to adjust the amount of outside air introduced and to close the outside air introduction.

5 to 7 show a second embodiment of the present invention, and in this example, a water reservoir 4 for collecting condensed water is provided in the bottom part of the case 1 on the upstream side of the evaporator 2. 4 is the same as the embodiment shown in FIG. The dropped condensed water hits and wets each outside air introduction pipe 10, and the latent heat generated when the condensed water that wets the outside air introduction pipe 10 evaporates flows into the upstream side of the evaporator 2 through the outside air introduction pipe 10. It is designed to cool the high temperature outside air.

In this example, ventilation may be performed by always sucking outside air through the outside air introduction pipe 10 during cooling, or a control valve that adjusts the amount of outside air introduced and closes the introduction of outside air may be used as shown in FIG. The fact that 12 may be provided is the same as in the embodiments shown in FIGS. 2 to 4 above.

The drain hole 5 may be configured in the form of a slit.

In addition, as shown in FIG. 7, the outer surface of the outside air introduction pipe 10 is covered with a water-absorbing member 13 such as water-absorbing cloth, and the condensed water dripping from the drain hole 5 sinks into the water-absorbing member 13 and vaporizes for 7 m.
The outside air may be cooled by heat.

In FIGS. 5 to 7, the configuration other than the above is the same as that in FIGS. 2 to 4, and the same reference numerals as in FIGS. 2 to 4 represent the same parts, and the functions and effects are the same. Also the second ~
It is the same as that in Figure 4.

As described above, according to the present invention, with an extremely simple configuration, it is possible to almost completely prevent the suction of condensed water by the blower fan, and to significantly improve the durability of the blower fan and its downstream parts. With the present invention, cleaning of water puddles and drain holes, which was extremely difficult in the past, can be done by opening the inspection cover 11 on the outer surface of the case.
There is no risk of clogging the drain hole, and even colder condensed water is used to introduce outside air for ventilation! Since it has a structure that cools air, it is possible to reduce the heat load during ventilation and completely prevent indoor air from rising during ventilation, which can improve the cooling effect. Combined with the fact that it is simple, inexpensive, and can be made small and compact, it can bring about great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional cooling unit, FIG. 2 is a sectional view showing a first embodiment of the present invention, FIG. 6 is a sectional view taken along line XX in FIG. 2, and FIG. 4 is a sectional view of the second embodiment. It is a partial sectional view showing a modification of the device. Figure 5 shows the second embodiment of the present invention.
A plan view, FIG. 6 is a YY sectional view of FIG. 5, and FIG. 7 is an enlarged view of a portion corresponding to part 2 of FIG. 6, showing a modification. DESCRIPTION OF SYMBOLS 1...Case, 2...Evaporator, 3...Blower fan, \4...Water pool, 5...Drain hole, 10...Outside air introduction pipe, 12...Control valve, 13...Water absorbing member. Above is Shiji・Zo 1 Akatsupu 3 Sen 0 1θ Od Ku 10

Claims (4)

[Claims] (1) In a cooling unit installed under the floor of a vehicle, the bottom of the case containing the evaporator is sloped so that the upstream side of the evaporator is lower than the downstream side, and the half of the case upstream of the evaporator is A water reservoir for collecting condensed water and a drain hole for discharging the condensed water collected in the water reservoir are provided in the part, and an outside air introduction pipe is provided to introduce outside air to the upstream side of the evaporator in the case, and the outside air introduction pipe is A cooling device for a vehicle, comprising means for cooling outside air introduced into the case through the condensed water. (2) The cooling means for the outside air introduced into the case has a structure in which an outside air pipe is disposed in thin ice accumulated in a puddle. The vehicle cooling device described in 2. (3) The means for cooling the outside air introduced into the case internal pressure is to install an outside air introduction pipe at the bottom of the drain hole so that the condensed water flowing down from the drain hole directly or indirectly wets the outer surface of the outside air introduction pipe and evaporates. The vehicle cooling device according to claim 1, characterized in that it has a structure that uses latent heat to perform cooling. (4) The outside air introduction pipe has a control valve that adjusts the amount of outside air and closes the introduction of outside air, according to any one of claims 1 to 3. vehicle cooling system.